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T. J. OURRIER & ,A. M BLACK.

TOOL BEST FOR LATHES.

Patented Jan. 15, 1867.

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To ALL WHOM IT MAY concnan;

T. J. CURRIER 7 AN D A. M. BLACK, OF WORCESTER, MASSACHUSETTS LettersPatent No. 61,166, dated January 15, 1867.

IMPROVEMENT 1N TOOL-RESI'S FOR LATHES.

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Be .it known that we, T. J. GURRIER and A. M. BLACK, both of the cityand county of Worcester, and

Commonwealth of Massachusetts, have invented certain new and usefulimprovements in Tool-Rests for Engine Lathes and other purposes; and wedo hereby declare that the following is a full, clear, and exactdescription of the same, reference being had to the accompanyingdrawings, forming a part of this specification, in which- Figure 1represents a perspective view of ourinvention.

Figure 2 represents a cross-section on line A Rig. 1; and

Figure 3 represents a longitudinal central section on line C and D, fig.l.

Tc'enable those skilled in the art to make and use our invention, wewill proceed to describe it.

In the drawings, A represents what is generally termed the poppet-block,which fits and works upon the slide-rest of the lathe in the ordinarymanner. B represents the tool-post; the tool; D the tool-rest, and E theset-sc'rew'by which the tool is held in place. The usual mode ofelevating or lowering the point a of the tool C is to loosen-the screw Eand place something under either the front or rear end of the tool-therest part D not being made adjustable for that purpose in machinesheretofore made. There is a great objection to this mode of adjustingthe tool, since in the operation the tool is very liable to slip eitherforward, back, or laterally. We obviate all these objections by makingthe part D, upon which thetool O rests, in circular and dove-tailed formto fit a'groove of corresponding'shape in the part A, aszfully shown inthe drawings. Upbn the outer surface of the dove-tailed part F of thepart I) is cut a section of a screw-thread, 6, into which the screw Gworks, the latter being placed upon the end of a spindle or shaft, H,which is arranged to operate as fully shown in the drawings. The screw G'is-fi rst slipped up into the slot 1: in the part D, when the shaft orspindle H is run in through the screw, the latter having a groove, d, toreceive the spline or stay-pin 'on shaft G. J is ahandle or crank bywhich shaft H is turned. By turning shaft H screw G will cause the partD to move toelevate or depress the point of cutter C, depending upon thedirection in which the shaft is moved. In fig. 3 the point of the cutteris shown in red lines turned up to illustrate the operation of ourinvention. To keep the part D from having any lateral play a metalpacking, f, is placed in one of the dove-tailed grooves and forcedagainst the part F by screws, 9 g g.' 'The end of shaft H maybe made toreceive a pipe-wrench if the crank-or handle J is found objectionable.It will be seen that by our invention the point of. the tool can beadjusted up or down with great precision, while screw G will always holdit in position, when once adjusted, until the position of the parts ischanged again by the movement of the shaft H. The invention isapplicable to any machine where there is a necessity for elevating orlowering the point of the tool-creaser, polisher, or other similardevices.

Having described our invention, what we claim therein as new, and desireto secure by LettersPatent, is- The combination with the poppet-block A.of the tool-rest D, shaft H, and screw G, substantially as set forth.

T. J. CURRIER, A. M. BLACK.

Witnesses:

Tnos. H. Dunes, DJL. MILLEn.

